Question

What is the y-value of the solution to the system of equations shown below? y=2x-9 x+y=12

Answer 1

For this case we have this:

y= 2x -9 (1)

And replacing equation (1) into the second we got:

x + 2x -9= 12

3x = 12+9

3x = 21

x = 21/3 = 7

And solving for y we got:

y = 2*7 -9 = 14 -9 =5